Row numberer not updating when changing page via paging toolbar

Ext version tested:

Ext 4.2.0

Browser versions tested against:

Chrome 27.0.1438.7 dev

Description:

When using a grid with a rownumberer column and the paging toolbar in 4.2.0, the row numbers aren't being updated when changing pages. For example, with 50 pages displayed, the row numberer shows 1-50. If you switch to page 2, instead of seeing 51-100 you see 1-50.

Steps to reproduce the problem:

Add a row numberer to a grid with a paging toolbar then change to another page

The result that was expected:

I expect the row numberer to display 51-100

The result that occurs instead:

The row numberer displays 1-50

Test Case:

Add

Code:

{xtype:'rownumberer'}

to the columns array in

Code:

examples/grid/paging.js

then open the example and click the "next page" button on the paging toolbar.